My wife is 5'. We just got her the smallest Troll. She loves it. I put the Surly Nice Rack on and she has not had any heel clip issues with Ortlieb Backrollers.
The great thing about the bike is its versatility. If the disc brakes fail in the middle of nowhere it can be easily fitted with the ubiquitous cantilever brakes. You can have four different bikes by changing tires/wheels from Fatbike to road bike (it will run 700c) to mountain bike to expedition touring bike.
There are more braze-on on the frame and fork than perhaps any other bike made(?) We shamelessly carry a lot of stuff when we tour. Our one major problem on the Asia tour was the rack-mount braze-on broke on my old Specialized Rock Hopper Comp. The rear dropouts on the Surly Troll give me confidence that this will not be a problem on our next tour.
That said, the Velo Orange bike looks pretty incredible too. Seems you can't go wrong with either.